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Financial Information by Geographic Area Data | 6 Months Ended
--- | ---
Sep. 30, 2013
Segments, Geographical Areas [Abstract] |
Industry Segment and Geographic Area Data | 11. Industry Segment and Geographic Area Data
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Quarter ended September 30, 2013 |  |  |  |  |  |
Total revenues | $ | 786,721 | $ | 49,770 | $ | 836,491
Depreciation and amortization, net of (gains) losses on disposals |  | 67,355 |  | 1,910 |  | 69,265
Interest expense |  | 22,977 |  | 141 |  | 23,118
Pretax earnings |  | 207,480 |  | 9,368 |  | 216,848
Income tax expense |  | 76,374 |  | 2,483 |  | 78,857
Identifiable assets |  | 5,626,460 |  | 149,885 |  | 5,776,345
Quarter ended September 30, 2012 |  |  |  |  |  |
Total revenues | $ | 695,622 | $ | 48,495 | $ | 744,117
Depreciation and amortization, net of (gains) losses on disposals |  | 59,972 |  | 2,070 |  | 62,042
Interest expense |  | 21,961 |  | 152 |  | 22,113
Pretax earnings |  | 162,693 |  | 9,516 |  | 172,209
Income tax expense |  | 60,267 |  | 2,522 |  | 62,789
Identifiable assets |  | 4,984,218 |  | 152,746 |  | 5,136,964
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Six months ended September 30, 2013 |  |  |  |  |  |
Total revenues | $ | 1,490,684 | $ | 92,638 | $ | 1,583,322
Depreciation and amortization, net of (gains) losses on disposals |  | 126,525 |  | 3,857 |  | 130,382
Interest expense |  | 46,163 |  | 283 |  | 46,446
Pretax earnings |  | 379,236 |  | 16,660 |  | 395,896
Income tax expense |  | 140,522 |  | 4,415 |  | 144,937
Identifiable assets |  | 5,626,460 |  | 149,885 |  | 5,776,345
Six months ended September 30, 2012 |  |  |  |  |  |
Total revenues | $ | 1,321,805 | $ | 89,988 | $ | 1,411,793
Depreciation and amortization, net of (gains) losses on disposals |  | 116,935 |  | 4,043 |  | 120,978
Interest expense |  | 45,300 |  | 304 |  | 45,604
Pretax earnings |  | 282,077 |  | 17,520 |  | 299,597
Income tax expense |  | 104,965 |  | 4,643 |  | 109,608
Identifiable assets |  | 4,984,218 |  | 152,746 |  | 5,136,964

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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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